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Service Revenue (Summary of Changes in Deferred Costs to Obtain and Fulfill Contracts) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2024 | May 31, 2023 | May 31, 2022
Capitalized Contract Cost [Line Items] |  |  |  |  |
Amortization | $ 231.7 | $ 219.1 | [1] | $ 202.1 | [1]
Costs To Fulfill Contracts [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Balance, beginning of period | 75.3 | 72.3 |  |  |
Capitalization of costs | 27.8 | 28.9 |  |  |
Amortization | (26.5) | (25.9) |  |  |
Balance, end of period | 76.6 | 75.3 |  | 72.3 |
Costs To Obtain Contracts [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Balance, beginning of period | 597.5 | 550.2 |  |  |
Capitalization of costs | 217.1 | 240.5 |  |  |
Amortization | (205.2) | (193.2) |  |  |
Balance, end of period | $ 609.4 | $ 597.5 |  | $ 550.2 |
[1] | The consolidated statement of cash flows for the fiscal years ended May 31, 2023 and May 31, 2022 include revisions to previously reported amounts related to the presentation of cash flows associated with short-term receivables purchased from the Company’s clients under non-recourse arrangements, net of funding reserves. See Note A for further discussion on the revision.

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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